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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a5fc13c0e682c8a0ed31f6f09bb45aa8d1a8d7c904326279f1d4556c9bb505' 
  AND token = 'kWs4BN33ClPHzL8jizlzI9iKsLQBtYxKxpvfdeXNijI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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