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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f5b67b63cb996d8ca9d32ea6499c115c8e42b9846b5f0c14770c3f0d7a71ba' 
  AND token = 'mKaG4RqUl8bjc6yaUIGMp7b3iaWE+NEV75D7RyOMup8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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