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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5fa07703fe35d31d0b2bbd41d42401e69ecf0c740c2d738c015ab24eabd361' 
  AND token = '3l4qqyLgv2h9os5HqE+WxnYNm/m8iSUxwjrHAWtNetc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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