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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76dd8c8af00d75480981e6a41ff16e9a43b3f29b5ae2528ed94c65f6ebbaba7b' 
  AND token = 'bj5ETUVk5j8cHrWtaW5z0eHqiE3p/RjOc2CYgeEiA5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}