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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6552af9486119993d82ee8427e6bea76f1dea219cacc2ba65a01ea104fd9897' 
  AND token = 'uf3PtWkO7bBaXA3dK2kDFDqV/B1uwGc1E6kz+0D4QLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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