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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b78d19580f227ce6ce753af6405874f84d3083e97dbf459c43ad3eedfdf1b6' 
  AND token = 'T2FbFgm4+glG4skJsIfqweFdGDcbYpubxoWX+WW0d4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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