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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3cdd8947bb481345b5341fd87fd91b1c3253a3d7653e15f74f867b4794ed008' 
  AND token = 'oPUkp4Hi4ICw1SNO1Zx1N5v8jP1+7KpoF8g6OZ1Llu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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