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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642f93af269e6c5d6e03faac6ffc46ec1caf61054b730ea0d4f9dd38bfae6d4e' 
  AND token = '9uDIh9HkSPhQQHYAlPc9IcKXxlazy/qlZJj34jQ7FPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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