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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae5757d3ba638f43c53d20e0bb21f598e0b4481e0cfd7012c36de722463570a' 
  AND token = 'ghYMVaSiaePixPHdqAt3xkYafaqik1N2s4ywKoIGAQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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