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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd601b8488fb433a6a9e1102caa468b22ba2e8138fb7e63984f12a7a4cbd7c69' 
  AND token = 'MNFAgozE0hds1s3XosAQLyQRJRScO4Sng1DMC0ONe9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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