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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6f04d5262e6aedaba70860ef04fa624c72b65a1563a8b38711a8d030bc60b8' 
  AND token = 'gye4db5kl490y5azDY/TgP+3+xh/v/ErcTR0ne1WL+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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