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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7db2e760be4cefe58fd135b2d435dc8bd3f627f0819ea0e6d81584d004f987' 
  AND token = '2NFLL0OgFiutl4AdGq1PHa50PhDaCjeCqq253wH/frQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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