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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f565901773f7482adf4cec872ddf59c6e1245a24120b418e792b1d4b41aa01c3' 
  AND token = 'Xwntdf2qvQ/4Uh9UTD2Qs8txzFRoMZjTha7Dia+kfo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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