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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78eb884b26a5cc9dbbe3915372645776d04c63dc5af957bfe00461e0c10f12fd' 
  AND token = '8SyflSd7NdM9EJ1yzgwp/orcY1URsVVCcPAshIpAlDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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