SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0546ee312ac4a88aac8396cb2c080d7198395c45ffe60f0174457d6bedba2822' 
  AND token = 'kez6TJldYvSACp+B7rsA/iDt+HZIcyzQog0Bgso8w7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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