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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90dbbdd0bc59cf051a6627023af3676237ad42e59b55dd4bb65d574dc40f1da2' 
  AND token = '8c1UIehLxiZYfjsQt7rkdYO+Nw7Is50WlbKN3UKI57c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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