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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffcff7ef90101e892b8cf5211eb97b39041719feac93afb77ee7648cb393b5d4' 
  AND token = 'fWY1lw0oDwRG45GkFAdc3ZZEMSgEZeXtQ7aG0WIC5hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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