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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c79808826d60010390cbb42cdf327b67aa2f97c973f7207d56a67fc55e65c32' 
  AND token = '3DSFU1QPcO9jUkOX+hJagrl9ofwWSNSmB2w/kXfHB2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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