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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573298ad647f12ee8c94502e065c446493309fe72f148bfc0f969673a4c2f696' 
  AND token = 'j8il/yRBG9Bq8OEfqtCvIrqSO5HyaCr6Y+I3r25KXyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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