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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b954761c892c524c824e5cead64bc4d918c09af939bf2f14e4da93c1058337c1' 
  AND token = 'WSj1G+tLH4Kyrf118u1ZoDGOHavb5SWFuojgjtpWyOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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