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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72cf54e0aca0b7355a909c33713108d2711a89d831d4cf3586a592e090a9198' 
  AND token = '82Vyi13DpTLZ5mjgoZvDrSdbbqOZDHe2J1+m/O7gZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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