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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d470be3407fb151a6bc6b49d090d0d269f4fae4d6f1d9d919865c76b0a915' 
  AND token = 'MqErYYXHRj9udG69TukOlaC6b+ZE6Cvco3Yd/uK6LA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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