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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bae26d1f48ca0877e6c7b5ef716ca33e5a666b671bfb1ce4e76dbd7f704478d' 
  AND token = 'y7DEeleYUH2+OqmJdGcGdM/nb1u2zfDiJPmTWF1IvDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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