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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f207f4134579d362abbe72f365e9ea0ed076ec73d5b81371cf1d681967a5d8' 
  AND token = 's6ioILP/Z2bgISbOrPbJh+1P+Xfg/SY4CsQ28/vXTdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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