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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ecd8a5ab8c87e4f8a7c025de60550396859e8236e60b94d1e040b5a52ad576' 
  AND token = '9xu6jOPRjqTHPfpCon9PX4j7lxT5PNKtxAawlveB5Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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