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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1432a8d912babc0b45ab6aa80134d63605b524857d5b56b505054392a6c3fc5' 
  AND token = '6Y6lJdza/m6fzb4bB63ODcVbkcdvXJaLRTHsy3Tma0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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