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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdadc2fd10f5a219113d017b7cbe3509d7fc1a923d7da28982ddbefe22f8a18' 
  AND token = 'qUnvqTfXJKdOrb16XWed/2ucxCw+ahoplTY4wjeIs0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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