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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d84bb8464632bae7033d982b05205ceb41707084eeae3ee0f9e3afcdac08aab' 
  AND token = 'HZPmJ6z16mcubvwko2T4hXsxnmZoC3XdOkc9wCws80c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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