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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1948af310042ff46a6a170282e772794cb06f0b6e39552b780c6049923f511b' 
  AND token = 'A7e0a2tWxXqDRiwh/SS7XuLX3hgdzcNQgh3ahUPc2j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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