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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185027ca0b2d41d2c1e33df001066b417f9b432969f9156d7297d1572ab40c25' 
  AND token = 'IYGGvb8m190q7CEPP2OqcoOdXzDphfsoPz+pAcMrYHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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