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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d901f588148f6cebff12f1365b757a80172f097555d821ac9e19c15344df43f' 
  AND token = 'SdS9uS/DUcBoX/EArJBiT6BMZlqiVph6B5s/1lnG9VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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