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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bd5fb10dc4bef60b637e27b40e0fd3910dc693b2f88ace90e767c8849e9db9' 
  AND token = 'Xvb0vdi8Jfmgscfu3QEqT3HR4aLTOKz6ClwBwDf8rzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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