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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226a683cc9ec7afcd504235643a16af1f81bb079a65b04f25b2829318f7de28b' 
  AND token = 'JsHk6FG2AxnyPVGUpsIteLA6S90e6JJRrYvYycbT1TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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