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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4192b7542ab3e4e140b86a552c3ebf7b984c94bad2b502aea2eb1558ffeb061b' 
  AND token = 'JzXuNVON0yjcLX4pWqSUmbCmPdohh4nG7IkHfTkIhFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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