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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24fdf88f5795035aa4ba9fc094bb141ca6316533e8a56a113fea2d86c4d73a2' 
  AND token = 'mLLeC9GJhuB30G7SSrTUFDJ5iaOAbOhaQJ3NiZkFdVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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