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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82041a5d7f9b220b4e82cf5c850c77e9121964c92bb7237e7d8b38dd98da182e' 
  AND token = '7f92Bhv5uHjVNRuIoWYqFzWbdMh/nDe5W3FMnkvxzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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