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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb4dbbf781aa966c29e80757ad9a60e0793a6ede428a404e289899be13698ec' 
  AND token = 'SqL1fx3F/c/iYSmJLyqLJx9VdIJlLu00BNcM73PCVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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