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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f5234732b43d027b51b2d709ea03d975831c6bf4e7ea8690a290ab98ff1dd1' 
  AND token = 'lyTTk1zaLFXB2yLjLzt7ziiFDlOmVKhXnf6GJD7MIT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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