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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a821ce1329572b199c7eae5003e6c0c832e0c15d137f9307694095b6c328e913' 
  AND token = 'OK6gtv0+OwFrbLIAhD05JbxVF9zq+nunUkMWAscJrdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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