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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8514cf90226e3abc93ac7c7ff9f8be231edce6c3739edb5bbcb4b541b666b2' 
  AND token = '3AM0fIC0Z+a9k0TtC+vgY6k363XJ7mqaoE2j6wf3LZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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