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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf024b7aa50a21822eec99c0dddcf43913945912ada695cf7527a31c68019af0' 
  AND token = '2mK0PX4GJuzCUM3va2fDGa/tUwaTH2mj4Mq6kFTPxFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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