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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eaa80d1b4895a8a8a32dd73b02ab9cd718f0ff248b5fd9e8df65864aa8de93b' 
  AND token = 'mLc9ESgcxFoxJjR1xuB6rBO9GoIi5wJGD33ZefLdpDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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