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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a21424d3829f9bc3fe56285e164985a579fd623a05bbe82cd82ce7505dd3e9e' 
  AND token = 'Xbx6gjO84IteSCOYSMx42QS46qR9tCtEsfEKokUyJtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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