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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566e55ba903a0586a59a9dbe09d7ae20f91024df2488669e01e202dc6b666c87' 
  AND token = '84v60qXGTmtT+Rbsa3WUHu9oAp77KMvC5fk01UhIlpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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