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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd02afa8c6048c28073b10d204bc40a21a2c7c3139dbc847d19d20a1e3abdcd' 
  AND token = 'DaQnIH33fjzKghn11B4nhEPZW6cX9gtTi7Mrprrqu2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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