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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86629fcf49133b79263379ea8f3acec181057b6b9b7b7f61ea61cd7d90444bcd' 
  AND token = 'cpp33eyfqqdeTWKaaGUCKas8M94ERBBbDESMmr00eTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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