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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108df33f0e45488a3b6229c67bf19fb6d5c08e40cf0245576bcee17c8f7a7e55' 
  AND token = 'Akg3H3l/m8Yo/5MEWuyJQaD05AOuby0uLm08w7z6Yz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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