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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf5ba7dd54c0a31842dc903ebfdcb37e5ab251558bff2f12eb51695c8b3baa2' 
  AND token = 'd9O/5AGVzCPbCGv02k1WztrVCAQtmZrC70QR6Ac0zWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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