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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f85a02a66f9813292df69f89e18efdc0d71ba279c1c21a12fa9530ce2f9b40d' 
  AND token = 'DKjo6j9scuVf44KLncPeP4opiA94D+t5cNDh+uILgHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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