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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4d77b4c51df21d7b727bf6e8b5625f8ddd655cabfb68c14967e66707c93fb5' 
  AND token = 'uzNpVeJ1atiwyo/qvWv1+nibUtcvRgWxIg73jN37OQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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