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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de43b199f8b2c2db3fd620ecfca21313d08c1d30b3a1251b06f27f080c969f4a' 
  AND token = '8QSaFBkmCFb/A/fuJRy15Gv6QErl2olOgdyK/CUI/f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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