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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f95abb2616945a0ed099e4535d297615927e0e2dc45ffec9cd1ea457fa826a' 
  AND token = 'N+hI7nP8e/QKweARZG4hSkXfW7R0mitMnnG1FyEio48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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