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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8d9346bfb3ac15b6824f3f2a92837d5a82fa21ed5a9501cab8dadac89341b6' 
  AND token = 'uvhbsj2GxSkbmJ6r+sAgEcSwcw62yAXQ1uBflqmccZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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