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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce72755ecbe2043a0ea158084f47feae5120e593ee2ef3d110475c03665711a' 
  AND token = '5YariT+iMgwOkviSS0RD11IVhgp1eaLSyDgrD8kPgnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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