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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149cb9ca3fb5edc48db1ea60b739f85542ad80757d718beee64ba41f9d91186f' 
  AND token = 'N17u19Z9llVHYa4FVWaUJqOt8mS1R49sGYYZI+4U5sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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