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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cca696052ce8af1e75ad9e400be75a72f9c21898001ef1eca9a38bb1e37136' 
  AND token = 'spgxPwmS3G6CikyBCQLknhfoSWEpAlL9b2yHeWsfsuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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