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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ad8e818a4b7fe5bb0a6d9eaa53874f613eb324e6e40f37e6470308d1380932' 
  AND token = '2tXyn+B1r9+nPFlnqkgnCQjUImKF8Ahijn753GN7RSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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