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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08b182813991a9117b39637ecea7780a13751479e4e09e3617dfdf325873c6e' 
  AND token = 'ZUh5F5QxX0RU+cWmLte8WkvwNSeNalnaudXk2YN+G3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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