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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca1b0ebf82f7629b639853a31b564adf7538381c36a1fd18ece2ff57f307f04' 
  AND token = 'S/3h8cwjvdrL2LnpRyi4kllhFlyLVWsJi/4sQ6NX8aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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