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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85da4ae8c98ce1c2b61a77506e557c4b41b9b2708c86c00b4f59a2c53b834bd' 
  AND token = 'Ll0FYXOrmAqIhI6cT3+0NtM0msmeYIWK2vwf+tAI8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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