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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f3b717e0ee9152b15131b610ef6feeaf0594dfed3829e1bc2bc959489054d5' 
  AND token = 'EXqHntkDSIigrrKlND2mlC0LKXRUiErlMI9m+8DYhm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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