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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a533fd3f3d7c1a36f567cbe3ba9a54fd66951b00c08a71fcd3b5dd7e9f817c1' 
  AND token = 'ARg/iWdl35imCZN/ksBj1tCdXmJV5rh9ebyRU20ndro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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