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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc08757bc6e6ae435e95c712416c9ae3f10f9c4d20026e1c17ba80771bcf38c1' 
  AND token = 'bvYMhYSdvK1LFssp7IXWAPXVfe54d8wV1hrvTY0TcBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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