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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2755a011bed3a01be6bdcc8abdad27e62d9b68e0ca954fcc4560b18da4ccac93' 
  AND token = '3owdupf19EO7n51HSRlehi8XdWodlia7/lX2FwEGkrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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