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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696911a62f4e4273200c7458f40a4ac876ef71b3e411056d7605c108d5e90a70' 
  AND token = 't9186Nhk6ruBhlKqVZx1uca4QeyxRotzoOQ28a2ZiR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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