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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae259bf8fac9492d6f143ff032d1f912be7e4af7811b5e9b73185eeb5e88cce' 
  AND token = 'ttKaMP0IAZxNVC5KcNJy1dcC8UOtteGC6M/PEQZ/Dw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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